<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <h3>{{ msg }}</h3>
      <button @click="fn">反转</button>
    </div>

    <script src="./vue.js"></script>
    <script>
      new Vue({
        el: '#app',
        data () {
          return {
            msg: 'hello world'
          }
        },
        methods: {
          fn () {
            // const list = this.msg.split('')
            // list.reverse()
            // this.msg = list.join('')

            this.msg = this.msg
              .split('')
              .reverse()
              .join('')
          }
        }
      })
    </script>
  </body>
</html>
